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Active latent heat storage with a screw heat exchanger

Experimental results for heat transfer and concept for high pressure steam
: Zipf, V.; Willert, D.; Neuhäuser, A.


Rajpaul, Vikesh (Ed.):
21st SolarPACES International Conference, SolarPACES 2015. Proceedings : 13-16 October 2015, Cape Town, South Africa
New York, N.Y.: AIP Press, 2016 (AIP Conference Proceedings 1734)
ISBN: 978-0-7354-1386-3
Art. 050044, 9 S.
International Conference on Solar Power and Chemical Energy Systems (SolarPACES) <21, 2015, Cape Town>
Fraunhofer ISE ()

An innovative active latent heat storage concept was invented and developed at Fraunhofer ISE. It uses a screw heat exchanger (SHE) for the phase change during the transport of a phase change material (PCM) from a cold to a hot tank or vice versa. This separates heat transfer and storage tank in comparison to existing concepts. A test rig has been built in order to investigate the heat transfer coefficients of the SHE during melting and crystallization of the PCM. The knowledge of these characteristics is crucial in order to assess the performance of the latent heat storage in a thermal system. The test rig contains a double shafted SHE, which is heated or cooled with thermal oil. The overall heat transfer coefficient U and the convective heat transfer coefficient on the PCM side hPCM both for charging and discharging have been calculated based on the measured data.